I don't know if you can say much about L-Glutamine in general.Well considering I'm not taking any protein supplements anymore my body composition looks OK.I think My muscles look bigger than when I was using protein shakes.The main reason I take this is immune system support as I suffer with hey fever.So far looks good.I had only one big attack after I did the lawn but I was back to normal the next day.This is my first year in the last 8 that I'm at the end of June with no pills for allergies.As for iHerb-Big Thank you, as I'm ordering from Ireland and for 3 day delivery with DHL for 10-12$ you cant beat that!